Testing device and method for railway-traffic-controlling apparatus



Jan. 31, 1928. I v

. P. N. BOSSART TESTING DEVICE AND METHOD FOR RAILWAY TRAFFIC CONTROLLING APPARATUS Filed July 13. 1926 A Zis ZKes 9/ Pp when De-eneryized.

l I I n K 12345 IO 15 Train Spgaed in Miles per- Hou? I INVENTORI 4 Al a A'iTORNEY 

